Adjustments of a scraper blade in a roller mill



Feb. 19, 1957 cs; R. LINDEN 7 2,781,541

ADJUSTMENTS OF A SCRAPER BLADE IN A ROLLER MILL Filed; Aug. 9, 1954 2 Sheets-Sheet 1 2/ 23 52 I3 I: 22 ll 2/ 22 '20 19 :2 I9 gl 4: i\i\ v I 5% a 44 22 22 sl; 5* E 4, O O

Fig. I

Gosia R. Linden INVENTOR.

AT TORNE YS Feb. 19, 1957 G. R. LINDEN 2,781,541

ADJUSTMENTS OF A SCRAPER BLADE IN A ROLLER MILL Filed Aug. 9, 1954' 2 Sheets-Sheet 2 Fig.

Gosfa R. Linden INVENTOR.

ATTORNEYS ADJUSTMENTS OF A SCRAPER BLADE IN A ROLLER MILL Gosta R. Linden, Park Ridge, N. .L, assignor to J. M.

Lehmann Company, Inc., Lyndhurst, N. .L, a corporation of New York Application August 9, 1954, Serial No. 448,615

3 Claims. (Cl. 1.5-256.5)

This invention relates to roller mills andhas for an important object to provide means in combination with a roller mill having a train of rollers for readily adjusting the scraping blade with relation to the last roller of said train and to permit removal of the scraping blade so that it and the rollers may be cleaned and so that the scraping blade may be readily replaced;

Another object of this invention is to provide in a roller mill of said type means securedto the frarne' of the mill for adjusting'thespacing and pressure'of the scrap ing blade to and against oneof'the rollers and to provide' means for the ready removal of said blade in its holder all of which are operable by adjustments, including a lever, which may be readily made by an unskilled operator.

A further object of this invention is to provide in a device of this kind means whereby the scraping blade may after being lowered to operating position be adjusted relative to one of the rollers.

With the foregoing and other objects in view, the invention will be more fully described hereinafter and will be more particularly pointed out in the claims appended 'hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views,

Figure 1 is a top plan view of. the mill;

Figure 2 is an end elevation thereof;

Figure 3 is a front elevation thereof; 7 Figure 4 is; a partial section on the line 4-4 of Figure 3; and

Figure 5 is a view of the apron adjustment rod, spring nited States Patent O manner.

and spring adjustment spindle taken at a 90 angle from the view of these elements shown in Figure 4.

The mill comprises three rollers, 10, 11 and 12, bearings for which are suitably supported in journals (not shown) in the upper portions .13, 13 of frame 14. Rollers 10, 11 and 12 are driven by motor 15 in any suitable manner such as by sprocket chain 16 diagrammatically shown. The direction of the drive is as shown by the arrows in Figure 2 so that the material to be processed is introduced between rollers 10 and 11 in any suitable manner such as through a hopper (not shown) and is carried by roller 11 to roller 12 and is'scraped therefrom by scraper blade 17 (see Figure 4). Means of any suitable conventional design operable by hand wheels 18, 18 are provided for adjusting the spacing and pressure between rollers 10 and 11 and 11 and 12 reagainst cam follower 41 mounted on apron adjustment 1 lower terminus.

2,781,541 Patented Feb. 19, 1957 from terminalroller 12. Apron 24 comprises a bottom section 25 and side flanges 24a, 24a. Bottom section 25 of apron 24, as is clearly shown in Figures 1 and 3, maybe tapered so that the material which has been processed by the mill may easily be gathered therefrom.

Apron 24 is provided with a plate 26 of any suitable material such as wood or metal integral with or attached underneath bottom portion 25 and running substantially the length of apron 24. Scraper blade 17 is fitted in a slot 27 in the end of plate 26 which is adjacent roller 22 in a manner by which it may be easily removed from plate 26 when apron 24 is removed from the mill. Plate 26 near the end adjacent roller 12 is provided with a dependent double pronged hook 28 which is disposed to engage the T -end of apron adjusting" rod which will be described more fully hereinafter. Plate 26 is also provided near its other end with a dependent lug 29 which is formed with an open-ended slot 30. Lower portion 31 of frame 14 may be. an integral casting forming front wall 32 and side walls 33 and it supports upper portion 13 of frame 14 in any suitable At a suitable position, as shown in Figure 4, apron supporting bracket 34 is secured to the flooring 35 of upper portion 13 by bolts 36, 36 or in any other suitable manner. Alternately apron supporting bracket 34 may be secured to front wall 32 of lower portion 31 in any suitable manner. Cylindrical lug 37 is provided near the outer terminus of apron supporting bracket 34 and is positioned so as to be engaged in slot 30 of lug 29 attached to apron 24 when apron 24 and scraper blade 17 are in operating position.

There is provided behind front wall 32, apron adjustment rod 38 which is slideable through openingv 39 in flooring 35 and extends downwardly through guide 40 attached to front wall 32 of frame 14. Cam follower 41 is secured to apron adjustment rod 38 slightly above its Apron adjustment rod-38 is connected through tension spring 42 to spring adjustment spindle 43 which passes through guide 44 attached to front wall 32. Tension spring 42 may be attached to apron adjustment rod 38 and spring adjustment spindle 43 in any suitable manner such as by having the ends 42a and 42b of tension spring 42 secured through holes 38a and 43a provided therefor near the ends of apron adjustment rod 38 and spring adjustment spindle 43 respectively. The lower end of spring adjustment spindle 43 is threaded as shown at 45 in Figure 4 and is thus adapted to receive tension adjustment nut 46 which when turned raises or lowers spring adjustment spindle 43 to decrease or increase respectively the tension of tension spring 42 on apron adjustment rod 38. The lower face 47 of guide 44 provides a bearing surface for tension adjustment nut 46. Indicating pointer 48 positioned to extend through aperture 49 provided for that purpose in front wall 32 is secured in any suitable manner on spring adjustment spindle 43 above guide 44. Reference to Figure 3 shows indicating pointer 48 and scale 50 mounted on front wall 32 and visible from the front of the mill for showing the position of spring adjustment spindle 43. Further reference to Figure 3 shows that tension adjustment nut 46 may be adjusted by reaching through large aperture 51 which is formed the lower portion of front wall 32.

Hand operated levers 52, 52 mounted on either side of frame 14 are fixably mounted on shaft 53 onwhich in turn is fixably mounted eccentric cam 54. 3 In the position shown in Figure 4 eccentric cam 54 does not bear rod 38. However, when either one of levers 52, 52 is turned so that eccentric cam 54 is turned substantially from the position shown'in Figure 4, cam follower 41 is lifted to the position shown in broken lines and the tension of tension spring 42 is removed from apron adjustment rod 38.

As previously stated the upper end of apron adjustment rod 38 is formed in a T as shown at 55 in Figure 5. T-portion 55 of apron adjustment rod 38 is'positioned so that it rests in double pronged hook 28 when receiving apron 24 is in operating position and thus holds scraper blade 17 in operative position adjacent roller 12. It is obvious that the rotation of adjustment nut 46 in the direction to increase the tension of tension spring'42 on apron adjustment rod 38 will either move scraper blade 17 closer to the surface of roller 12 or increase the pressure of scraper blade 17 against the surface of that roller. It is further obvious that when either one of levers 52, 52 is turned to rotate eccentric cam 54 to raise cam follower 41 to the position, shown in broken lines, all spring tension is removed from apron adjustment rod 38 and hook 23 may be readily removed from T-end 55 of apron adjustment rod 38 and cylindrical lug 37 may readily be slid out of open ended slot 30 in lug 29 by raising that end of receiving apron 24rthus permitting the removal of the apron and blade assembly.

Having thus described my invention, what I claim is:

l. The combination in a roller grinding mill having a frame, a plurality of rollers comprising a train of rollers and a scraping blade disposed to scrape material processed by said rollers from the surface of said last roller of said train of an apron detachably pivoted to said frame for receiving said processed material scraped off by said scraping blade, said scraping blade secured to said apron at the end thereof distant from the portion thereof pivoted to said frame, a hook suspended from the bottom of said apron near the portion thereof holding said scraping blade, a vertical rod terminating in a T-section at its upper end slideably mounted within said frame with its T-shaped end disposed to engage said hook, a tension spring exerting a downward pull on said rod, a nut rotatably mounted on a threaded lower portion of a second rod attached to said tension spring arranged to vary the tension exerted by said spring, a stop for said nut mounted on said frame, a flange fixed on said first rod above said spring and disposed to be raised by a cam mounted on said frame and operable by a lever whereby the tension of said spring on said first rod is released and said hook may he disengaged from said T-shaped terminus of said first rod.

2. A scraping blade in a roller mill having a frame and a plurality of rollers in which said scraping blade is disposed and arranged to scrape the, material processed by said mill from the surface of one of said rollers, an element detachably pivoted to said frame, means for mounting said scraping blade on said element, means for adjusting the position of said scraping blade with respect to the one of said rollers comprising a hook type member dependent from said element and positioned between said scraping blade and the point of pivoting said element to said frame, but nearer to said scraping blade than to said point of pivoting, a rod having its upper end shaped to engage said hook type member, extending downwardly therefrom and slideably mounted to said frame, a tension spring attached to the lower end of said rod, a second rod attached to the other end of said spring, means for adjusting and fixing the vertical position of said second rod, a cam follower attached to said first rod near its lower end and a lever operated cam disposed to raise and lower said cam follower as said lever is rotated whereby said first rod is raised so that its upper end is disengaged from said hook type member.

3. A scraping blade in a roller mill having a frame and a plurality of rollers in which said scraping blade is disposed and arranged to scrape the material processed by said mill from the surface of one of said rollers, an element detachably pivoted to said frame, means for mounting said scraping blade on said element, means for adjusting the position of said scraping blade with respect to the one of said rollers comprising a hook type member dependent from said element and positioned between said scraping blade and the point of pivoting said element to said frame, but nearer to said scraping blade than to said point of pivoting, a rod having its upper end shaped to engage said hook type member, extending downwardly therefrom and slideably mounted to said frame, a tension spring attached to the lower end of said rod, a second rod attached to the other end of said spring, a threaded portion of said second rod at its lower end, a guide member mounted on said frame adapted to pass said second rod therethrough, an internally threaded element adapted to be turned on the threaded portion of said second rod and disposed to bear against the lower face of said guide member, a cam follower attached to said first rod near its lower end and a lever operated cam disposed to raise and lower said cam follower as said lever is rotated whereby said first rod is raised so that its upper end is disengaged from said hook type member.

References Cited in the file of this patent UNITED STATES PATENTS 489,323 Noble Jan. 3, 1893 743,955 Thompson Nov. 10, 1903 1,348,535 Rosenfield Aug. 3, 1920 1,509,612 Ruckriegel Sept. 23, 1924 FOREIGN PATENTS 480,445 Great Britain of 1938 

